message ''Work item 000000000000 cannot be read'' in SWEL transaction

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hi ,

i have activated the standard workflow WS20000387 for production orders.

when i cretaed a production order the work item is not triggering to my inbox.

when i checked the transaction SWEL its showing the message "Work item 000000000000 cannot be read'' in the log. but when i execute the workflow manually its triggering the work item into business workplace.